Martin was originally arrested on Aug. 27, more than a week after anonymous hackers, called the Shadow Brokers, publicly leaked hacking tools that may belong to the NSA. Sample files of those tools appear to be dated most recently to 2013.

It's unclear if Martin's arrest is in any way connected. But some security experts have been speculating an NSA insider may have been behind the ShadowB rokers leak. The sample files of those hacking tools actually work and may be worth a small fortune.

Martin initially denied he had stolen any material when interviewed by investigators, but later admitted he had taken them and knew he had no authorization to do so, according to the DOJ's criminal complaint.

Martin's attorney, however, has reportedly said there's no evidence proving his client betrayed the U.S.

"What we do know is that Hal Martin loves his family and his country he served," James Wyda, a federal public defender, told the Baltimore Sun.

Hard-copy documents and digital information related to the stolen materials were found in Martin's home in Maryland and his vehicle, the DOJ alleged. If convicted, Martin could face 10 years in prison for theft of government property and another year for unauthorized removal of classified materials.